Why does my basement sink gurgle when the kitchen sink drains?
Air is being pulled through the basement sink trap because the drainage system lacks proper ventilation or has a blockage. This pressure imbalance creates loud bubbling noises and disrupts normal plumbing flow.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Using a sink plunger
- 2Trying to clear the drain as far as hand can reach
- 3using boiling water
- 4Swapping improper fittings like Wye fittings for Tee fittings
- 5Using an inflatable bladder or plumbing snake to clear potential clogs in the main drain line
- 6Pouring boiling water down the drain
- 7reaching as far as hand can reach
- 8trying baking soda and white vinegar
- 9Cleaning out the P-trap
- 10Loosening the assembly to adjust the slope and ensure a downhill flow toward the wall
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“Currently, after plunging and using boiling water, the sink will now drain but VERY slowly (over 10+ hours I'd say for a small amount of water).”source ↗
“A week ago, I vomited in my bathroom sink in my apartment. Now, I've been out of a sink for a week even after clearing the drain as far as my hand could reach, and I used a sink plunger.”source ↗
“Currently, after plunging and using boiling water, the sink will now drain but VERY slowly (over 10+ hours I'd say for a small amount of water).”source ↗
“Not having a bathroom sink has significant put part of my daily personal hygiene on hold and I want my bathroom back.”source ↗
“Every time I turn on the kitchen sink and it drains, it causes a loud bubbling sound that comes out of the basement sink.”source ↗
“I assume it’s a ventilation issue but I do not know how to fix it.”source ↗
“Currently, after plunging and using boiling water, the sink will now drain but VERY slowly (over 10+ hours I'd say for a small amount of water).”source ↗
“Recently replaced this copper part now water doesn’t go down (it does but very very very slowly). Did I do something wrong?”source ↗
“Yeah, the original setup had the same parts and worked. The copper piece bursted, so I removed them and took them to a hardware store and bought the same pieces. The guy even cut them for me to be of the same size. I installed everything, and now the water is slow.”source ↗
Where this came up
People with this problem also raised
- 7Why is a newly installed sink drain leaking above the trap?
- 9How to fix an off-center toilet drain during a remodel
- 7Can you fix a cracked or broken kitchen sink yourself?
- 2Why does my shower make a humming noise?
- 4Why are white sand crystals clogging my faucets every couple of days?
- 4Why do kitchen sink slip joints keep coming loose?